x平方减y平方减2加1因式分解x平方减y平方减2x加1因式分解

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x平方减y平方减2加1因式分解x平方减y平方减2x加1因式分解x平方减y平方减2加1因式分解x平方减y平方减2x加1因式分解x平方减y平方减2加1因式分解x平方减y平方减2x加1因式分解题目不对吧!y

x平方减y平方减2加1因式分解x平方减y平方减2x加1因式分解
x平方减y平方减2加1因式分解
x平方减y平方减2x加1因式分解

x平方减y平方减2加1因式分解x平方减y平方减2x加1因式分解
题目不对吧!

y平方减2加1???

y^2前应为正号或x^2前为负号
(题目错了!!)

x^2-y^2-2x+1
=(x^2-2x+1)-y^2
=(x-1)^2-y^2
=[(x-1)-y][(x-1)+y]
=(x-1-y)(x-1+y)